/Engine/Source/Runtime/Slate/Public/Framework/Application/SlateApplication.h
Allows you do some operations for every registered user.
void ForEachUser ( [TFunctionRef](API\Runtime\Core\GenericPlatform\TFunctionRef)< void([FSlateUser](API\Runtime\Slate\Framework\Application\FSlateUser) &)> InPredicate, bool bIncludeVirtualUsers )